/* ===================

AX2E (AXESCON XACML 2.0 Engine) is the Java authorization engine, which implements OASIS XACML 2.0 standard.
Copyright (C) 2007 AXESCON LLC

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA


Contact: AXESCON LLC - info{at}axescon.com

 =================== */
package axescon.xacml.engine.fn;

import axescon.xacml.api.*;
import axescon.xacml.model.policy.AttributeValue;
import axescon.xacml.model.shared.attr.BooleanAttribute;

/**
 * @author Date: Sep 28, 2005
 *         Responsibilities: implements basic equalty predicate,
 *         applicable to string-equal and some others
 *         see A.3.1 Equality predicates
 */
public abstract class FnComparisonBase extends AbstractFn implements Fn, MatchFn {

    public int getArgTypeListLength() {
        return 1;
    }

    public int getMinArgListLength() {
        return 2;
    }

    public Liquid exec(Liquid[] args) {
        return new Liquid(new BooleanAttribute(match(args[0].getSingularUnsafe(), args[1].getSingularUnsafe())));
    }


    public abstract boolean match(AttributeValue arg0, AttributeValue arg1);

    public Class getReturnDataType() {
        return super.getBooleanReturnDataType();
    }
    

}
